<div class="default" :class="{'test': express - 1 === 0, 'has': has}"></div>
<div :class="[ something, { 'test': test, 'has': has } ]"></div>
<div class="default" :class="{selected: item.selected, 'has': has}"></div>
<div class="default" :class="value >= 0 ? 'increase': 'decrease'"></div>
